I recently got my 350z about ~2 months ago. I have not really noticed but when comparing to another 350z my exhaust sounds different. The only difference is this piece pictured. I was wondering what you call this 'mod'. In the other 350, it seemed like this was a cylinder shape and looks like its been replaced by a straight pipe. Sorry for being a noob. Hope someone helps

 

Resonator?

 

gotta be a resonator...

 

So they took it off and put on a straight pipe?